Saitama is a hero who only became a hero for fun. After three years of special training, though, hes become so strong that hes practically invincible. In fact, hes too strongeven his mightiest opponents are taken out with a single punch, and it turns out that being devastatingly powerful is actually kind of a bore. With his passion for being a hero lost along with his hair, yet still faced with new enemies every day, how much longer can he keep it going?